#计算: 1-3+5-7+9…99 = ?
# i = 1
# s  =0 
# fu = 1
# while i<=99:
#     if i%2==1:
#         # print(i)
#         s = s+i*fu
#         fu = -fu
#     i+=2


# m = 0
def num():
    while n>0:
        n+=1
    return n*'*'
num(5)